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rotation of timage

Posted on 1998-04-12
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Last Modified: 2011-09-20
how can i rotate a timage at a specific degree's like 90 degree's..... i tried the one posted by kabae but i dont know how it works.... a detailed sample code well be much appreciated...
thanks in advance.....
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Question by:kabae
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pjdb earned 40 total points
ID: 1361418
Try this one :

On a form, drop a Timage (and load any image you want in it) and a button. Put the folowwing code in the onclick event :

procedure TForm1.Button1Click(Sender: TObject);
var
      i, j:longint;
      work:Timage;
begin
      {create a new Timage in memory}
      work:=Timage.create(application);
      {adjust the size of the new component}
      work.width:=image1.height;
      work.height:=image1.width;
      {for any column}
      for i:=image1.canvas.cliprect.left to image1.canvas.cliprect.right do
            {for any row}
            for j:=image1.canvas.cliprect.top to image1.canvas.cliprect.bottom do
                  {transpose the pixel -> to modify the rotation, just change this line}
                  work.canvas.pixels[image1.canvas.cliprect.bottom - j, i]:=image1.canvas.pixels[i, j];
      {determine the new size of the image on the form}
      image1.height:=work.height;
      image1.width:=work.width;
      {put the new image in the image on the form}
      image1.picture:=work.picture;
      {release the image use in memory}
      work.free;
end;

It seem quite quick (it rotate a 20829 pixels BMP in .7 second)

JDB
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Author Comment

by:kabae
ID: 1361419
my goodness MASTER PJDB
ur d best.. u got it...i love it.. its a work of art...
where did u learn how to do that...
thank u thank u ......very very much ... i will never ever forget u in my whole life.....

from jack of the PHIL....



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Author Comment

by:kabae
ID: 1361420
!!!question!!!
 if i stretch the image i got a white color in the side of the image...

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Expert Comment

by:pjdb
ID: 1361421
Well to stretch the image, i suggest that you replace the line
image1.picture:=work.picture;
by :

image1.canvas.StretchDraw(rect(0, 0, newwidth, newheight), work.Picture.graphic)

where newheight and newwidth are the new size on the image.

JDB
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